Cochran joins from Catalyst, where as the managing director he worked across a range of the agency's clients including Barclaycard, United Biscuits and Nestle Purina.
He previously worked at Hicklin Slade & Partners on accounts including Coors, Diageo and Britvic. In his new role, Cochran will be charged with spearheading the development of Iris' European new-business activity.
Ian Millner, the Iris managing director, said: "Jeremy has the Iris DNA: honesty, openness, dynamism and talent. His management and business development track record will help us blaze a trail across Europe."